Relevance. The use of mineral fertilizers in the cultivation of tomato in the first place should ensure the best conditions for the nutrition of plants during the entire growing season in accordance with their need.The research methodology was based on generally accepted methods for vegetable growing. The main goal of this study was to improve the zonal technology for cultivating tomato in open ground using leaf dressing with KCL and KNO3 preparations, aimed at increasing the level of yield during irrigation in the north of the Astrakhan region. Field experiments were carried out at the experimental irrigated land use area of the Federal State Budgetary Scientific Institution "Caspian Agrarian Federal Scientific Center of the Russian Academy of Sciences" in the period from 2021 to 2023. The scientific novelty of the study was the theoretical and practical justification for the use of leaf dressing with KCL and KNO3 in the cultivation of vegetables, aimed at the formation of highly productive commercial products.Results. During the research work, a comparative analysis of various standards of use of drugs was carried out, highlighting the most promising option. Three-year studies found that the use of potassium fertilizer KCl with a concentration of 0.5%), 30... 40 days. after planting (flowering), 50 days. after planting and 60 days. after planting gave a significant increase in yield relative to the control option. Conclusions. Based on the results of the analysis, an average of five charges, the KCl treatment variant Background + 3 (concentration 0.5%) was identified, which had the highest yield of 130.56 t/ha. This option was significantly different from both control and other options under study. The increase relative to the control was + 4.08 t/ha or + 3.2%.

Timeliness. The prerequisites for the cultivation of bog cranberry (Vaccinium oxycoccos L.) in industrial plantations have led to an increased demand for high quality planting material obtained by clonal micropropagation (in vitro). Studies have been carried out on the of ex vitro growing completion of cranberry plants using different mineral fertilizers and types of light under greenhouse conditions.Methods. Ex vitro plants of a selected form of cranberry (Vaccinium oxycoccos L.) obtained using the clonal micropropagation technique were the objects of research. Experimental adapted cranberry plants were planted in 0.5 L containers in 'Veltorf' peat substrate with an acidity of at least pH 3.5-4.0, to which mineral fertilizers were added according to the variants: APAVIVA N15P15K15(S10) 0.08 and 0.16 g/L, Sulfoammophos N16P20(S12) 0.072 and 0.144 g/L, N12P52 0.1 and 0.2 g/L, control without fertilizer. The plants were placed under different types of light: under LED phytolamps (UnionPowerStar – 40W-T) with a photoperiod of 16 hours and under natural light (without the use of additional lighting) under greenhouse conditions.Results. It was found that during of the ex vitro growing completion of bog cranberry (Vaccinium oxycoccos L.) plants in containers, the advantage of LED phytolamps was revealed, when using them in all experimental variants on the 42nd day of growing the morphometric indicators of plant development were almost 2 times higher than in plants grown under natural light. The type of mineral fertilizers and type light significantly influenced the total length of shoots (82.9±13.74- 107.4±35.95 cm vs. 58.6±20.92 cm in control) and leaf surface area (41.1±6.46-54.1±4.67 cm2 vs. 22.9±9.63 cm2 ). Conclusion. The results we obtained contributed to a better representation of the ex vitro growing conditions of bog cranberry (Vaccinium oxycoccos L.) plants using different types of lighting (phyto-lighting with a 16-hour photoperiod and natural light – without adding additional light) and the selection of optimal doses of mineral nutrition. The best, under LED lighting, were N16P20(S12) at a concentration of 0.072 g/L and N15P15K15(S10) at a concentration of 0.16 g/L.

In conditions of the Left Bank Forest Steppe of Ukraine, the following scheme aimed to increase in productivity of late-ripening white head cabbage up to 65.7 t -ha is proposed. After predecessor harvesting it is advisable to straw plowback with simultaneous application of N40 followed by sowing and plowing of green-manure of wiki with pre-application of N60P60K45 and three times plant feeding (development of 5-6 leaves, beginning of the formation of rosettes leaves, and formation of head) by Kristalon at concentration of 3 kg / ha. For the system of «organic farming», the application of the microbiologic specimens Baikal EM-1U or Fitotsid-r and Azotofit-r is recommended.

The productivity of agricultural crops is determined by the choice of varieties, planting material, the optimal time of sowing and planting depending on the climatic conditions of the region, the use of organic and mineral fertilizers, and care methods. Planting material plays an important role in the growth and development of onions and the formation of yield. Onions are very demanding in terms of nutrition, this is due to the length of the growing season, growth rates and poorly developed root system. To obtain high and high-quality onion yields, it is necessary to use fertilizers in an accessible form. Water-soluble complex mineral fertilizers quickly and evenly penetrate deep into the soil. Fertilizers improve the growth and development of plants, regulating nutrition processes, increase the yield and quality of the resulting products. As a result of many years of research, it was found that optimizing the mineral nutrition of onions through the use of fertilizers in active form provides a significant increase in the yield of onions. A comparative assessment of the productivity of onions when grown from sets of different fractions using water-soluble complex mineral fertilizers in the conditions of the Udmurt Republic has been little studied.Materials and methods. The purpose of the research: to improve the technology of cultivating onions depending on the fraction of the set and fertilizing with water-soluble complex mineral fertilizers. In 2020–2021 On onions of the Stuttgarter Riesen variety, a two-factor experiment was carried out to study the effect of fertilizing with Aquarin and Rastvorin fertilizers when using different fractions of sets for planting. The studies were carried out using generally accepted methods.Results and its discussion. In the Udmurt Republic, the optimal for planting Stuttgarten Riesen onions is the medium and large fraction of the set, and the positive effect of water-soluble complex mineral fertilizers Aquarin and Rastvorin on the yield and its structure has been revealed. However, it is more economically profitable to use the fine fraction of sets when growing onions.

Relevance. The production of onions and its preservation for the year-round provision of the population is an important strategic task. In March-May, there is often a shortage of onions due to high storage losses and incorrect determination of the optimal timing of implementation.Methods. Studies on the effect of fertilizers and plant growth regulators on the preservation of onion hybrids were conducted in 2014-2017 at the ARRIVG-branch of the FSVC. We tested 3 hybrids of onions grown in an annual culture on 6 variants of plant nutrition backgrounds. Harvesting of onions (turnips) was carried out manually, followed by drying in a greenhouse and laying for storage in a vegetable storehouse at a temperature of -1...0°C and a humidity of 80-90%.Results and discussion. The optimal duration of storage of new hybrids and the terms of sale of products when stored in cooling conditions for onions. Data on the shelf life and implementation of onion hybrids, depending on the nutrition background, are presented. Mathematical descriptions of the dependences of the total losses of 3 modern hybrids on the duration of storage and the influence of fertilizers and growth regulators are obtained, which is of great practical importance for the agricultural and industrial complex. Conclusions. A positive effect on the preservation of onions of treatments of vegetative plants with solutions of potassium nitrate (10 kg/ha), Zircon (0.25 l/ha) and Tenso Cocktail (0.7 kg/ha) against the background of N90P90K90 was revealed. The maximum yield of marketable products after 7 months of storage at -1...0℃ and 80-90% humidity in Bennito F1 was on the N90P90K90 + KNO3+ Zircon + Tenso Cocktail variant-89,6%, losses from diseases 2,8%; Poisk 012 F1 on the variant with the use of Zircon against the background of N90P90K90-52,1%, losses from diseases 31,2%; Pervenec F1 on the N90P90K90 + KNO3 variant- 91,4%, losses from diseases 1,4%. Pervenec F1 was distinguished by the best preservation during three-and seven-month storage. In general, the use of micro-fertilizers and a growth regulator had a positive effect on the preservation of onions.

In the studies of 2014-2016 years on rich medium-loamy alluvial soils of the Moscow region in the cultivation of hybrids of onions Pervenets F1, Bennito F1 and Poisk 012 F1 in drip irrigation conditions in an annual crop, the best yield of Repka 45.1 t/ha, 47.9 t/ha and 59.9 t/ha, respectively. The greatest effect was obtained from the complex application of N90P90K90 (main) in combination with plant fertilization with potassium nitrate and Zircon growth regulator during the period of intensive growth of vegetative mass and the beginning of bulb formation for late Bennito F1 hybrids and Poisk 012 F1, and for the medium-unrided hybrid the Pervenets F1 system was the best N90P90K90+Zircon. This system allowed to obtain a high yield of standard products (up to 93%) with good bio-chemical quality of the onion. New technologies of cultivation of onions in an annual crop with the complex use of drip irrigation, fertilizers and new hybrids of intensive type, allow in the conditions of the Central non-Chernozem zone to obtain the yield of onion-turnip at the level of 50-60 t/ha, with the output of standard products 80-93%. The best biochemical quality indicators of bulbs were obtained with the complex application of fertilizers with the growth regulator Zircon, with the cultivation of hybrids Pervenets F1 and Bennito F1, and hybrid Poisk 012 F1 is not mature enough in the Moscow region. From the conducted research it can be concluded that the studied hybrids of onion Pervenets F1, Bennito F1 and Poisk 012 F1 when grown in annual crops in terms of Non-Chernozem zone of the Russian Federation use better fertilizing than the main fertilizer.

The influence of different rates of organic and mineral fertilizers applications, the timing of the use of planting on the yield of tubers and green mass of topinambur cv. Skorospelka and product quality are described in this paper. In conditions of the non-Chernozem zone of the Russia, it is recommended to grow topinambur at least 3 years at the same place resulted in yield on 2-th and 3-th years similar to first year of growing. The application of manure (90 t/ha) and 1/3 NPK doses allowed to get equal yield at first, second, and third year of growing.

In field experiments, the optimal pre-irrigation moisture levels of the soil, plant density and fertilizer regulations to ensure maximizing the table beet crops with good qualities of roots under foothill zone of the Chechen Republic have been found.

Relevance. The study of the reaction of potato varieties, especially new ones, to the use of a complex of agrotechnical techniques, including foliar top dressing with water-soluble fertilizers, is an urgent task. For this purpose, 4 potato varieties of different ripeness groups (Red Scarlett, Nevsky, Golubizna, Grand) were studied in two regions of Russia using agrochemicals Agrovin Micro. Methods. The article presents experimental data on the study of biometric indicators, yield and quality of potatoes for non-root top dressing in conditions of leached chernozem and sod-podzolic sandy loam soils of the Central region of Russia. The objects of research were potato varieties of various ripeness groups. Foliar fertilization of plants with agrochemicals Agrovin Micro was carried out in the phases of germination, budding and 20 days after the last treatment in two consumption rates – 1.0 and 2.0 l / ha. Control – without processing (K) with background N90Р90К135.Results. On average, over the years of research, the best options for all varieties turned out to be options with the use of additional leaf treatment with an agrochemical at a maximum dose of 2 liters /ha. Due to three-fold foliar top dressing for the critical phases of potato plant growth, the greatest yield increases and maximum values of dry matter and starch content to the mineral background were obtained. In the conditions of the Tambov region, the increase in yield, depending on the variety, ranged from 24.2 to 59.3% or 6.0-10.5 /ha and in the conditions of the Moscow region – 3.3-28.9% or 1.2-7.1 t/ha. The most suitable for processing into fried potato products from the studied varieties turned out to be Red Scarlett and Grand. All other things being equal, the color index of crispy potatoes and fries on these varieties was higher than the Nevsky variety by 1.0-1.5 points.

Researches conducted on lands Nikolayev state agricultural research station IIA NAAS in 2017- 2018. Soil of an experimental plot is chernozem southern weakly eroded clay loamy on loess’s, it is noted by high contents potassium, average – phosphorus and it is not enough provided by nitrogen. Climate of region – continental, is characterized sharp and repeated by fluctuations annual and month temperature of air, greater spare of heat and aridity. Agrotechnic in experiment was generally accepted for southern Steppe of Ukraine. Scheme of experience included three factors – a sowing periods: II ten-day period of October (winter), II ten-day period of November (underwinter), I ten-day period of April (spring); variants of fertilizers: without fertilizers (control), recommended dose (N60P60) and N30Р30 broadcast + N30Р30 with irrigated water; the modes of irrigation: 80-70-70% of minimum moisture-holding capacity and 90-80-70% of minimum moisture-holding capacity. It is shown that hyssop – valuable spicy-aromatic culture, which on their own biological particularity, requirements to soil-climatic conditions can be successfully grown in southern Steppe of Ukraine, providing high harvest of floral mass for use in medical pharmacology. Most productivity variety Marquis (at a rate of 28.4-28.5 c/hа dry cheese) provided in variant, where contributed 50% dose of fertilizers broadcast and 50% with irrigated water and winter sowing period of culture. Maximum contents of essential oil has fixed in same variant at mode irrigation 80-70-70% of minimum moisture-holding capacity, where it has formed 0.85 %. Contents of ascorbic acid in plant raw material varied from 100.4 before 104.9 mg%.